How GOSAT has provided uniform-quality spectra and optimized global sampling patterns for seven years
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1 IWGGMS -12 Session II: SWIR Spectroscopy & Retrieval Algorithms How GOSAT has provided uniform-quality spectra and optimized global sampling patterns for seven years June 7, 2016, Kyoto Akihiko KUZE, Kei Shiomi, Hiroshi Suto
2 GOSAT status -2-
3 New Tatami mat is fine. New??? is also fine. But Older instrument becomes much better. Well characterized and calibrated. (1) Very slow radiometric degradation after two yeas in space (2) More stable secondary pointing mechanism than the primary one. Three anomalies: root cause and solutions are made clear. (3) Minimized calibration errors in both SWIR and TIR (4) Well-calibrated and user-convenient L1B V201 (approximately 7 years) is being reprocessed in order to provide the same spectral quality and seamless data. June, 2016, IWGGMS 3
4 GOSAT and TANSO status in space One of the two solar paddles stopped its rotation. (June 2014) TANSO-CAI Healthy TANSO-FTS (1) Metrology alignment changed > Biased interferogram (2014) (2) Pointing mechanism switched (2015) More detailed information A. Kuze et al.: Update on GOSAT TANSO-FTS in space, Atmos. Meas. Tech., 2016 June, 2016, IWGGMS 4
5 GOSAT 7.5 years operation Milestone * Launch FTS Nominal Pointing Pattern FTS Pointing * * Solar paddle accident Unstable Pointing * * Switching Pointing mechanism Cryocooler suspend 1, 3 p- 5p-CT 3p-CT 3p-CT CT Primary Secondary FTS interferogram No bias 800 fringes bias FTS Operation SWIR (S) and TIR (T) S S & T FTS L1B V FTSL1B V CAI L1A V Re-processing (no geometry correction) Re-processing (pointing error, biased interferogram corrected) Latest version Latest version Latest version Lunar calibration after the 2014 solar paddle accident has been canceled. Orbit control scheduled in 2016 summer will be postponed. June, 2016, IWGGMS 5
6 GOSAT orbit and local time Out-of-plane orbit control for the adjustment of the inclination of the orbit phase: to be postponed to avoid rapid ZPD shift (FTS mechanism anomaly) and continue glint and target observations. June, 2016, IWGGMS 6
7 Level 1 V201and Calibrations -7-
8 Radiometric Calibration -very slow after rapid degradation for the first 2 years- TANSO-FTS (0.76, 1.6, 2.0 μm) TANSO-CAI (0.38, 0.67, 0.87, 1.6 μm) (1) Radiometric Degradation Factors using RRV (Nevada) campaign data (2) FTS L1B V201 provide both classic (unit of V/cm -1 ) and radiance converted and degradation corrected (unit of W/cm 2 /str/cm -1 ) radiance spectra June, 2016, IWGGMS
9 Spectroscopic Calibration -Precisely the same spectral resolution has been maintained - Zero path difference (ZPD) shift (half laser fringe) since launch. For all retrieved spectra either by repositioning ZPD or by applying an asymmetric weighting function when the shift is too large. June, 2016, IWGGMS 9
10 Geometric Calibration - Stable secondary pointing mechanism - Pointing system Primary (PM-A) Pointing offset Time dependent (correction table of every two week) L1B V201 Geolocation Bestestimate geolocation Not corrected Corrected (AT and CT angles independent) Secondary Constant since Feb. Corrected Corrected Pointing offset since launch. (PM-B) 2015 CT angle dependent (The same as the geolocation) (1) No offset the angular resolver has as yet been detected. (2) The axes of the optical path and CT rotation are slightly misaligned: repeatable and L1B V201 product corrected geolocations better than 0.5 km. (3) When planning target observations, offset correction is implemented. No need for additional correction using the CAM data. June, 2016, IWGGMS 10
11 Level 1 V210 for TIR Modified non-linearity correction Greenland Mar23, 2015 Double Difference SSEC S-HIS FTS onboard ER-2 vs GOSAT (V203) ~ = ( R GOSAT OBS ~ R GOSAT CALC ~ ) ( R SHIS OBS ~ R SHIS CALC ) Known micron GOSAT(V161161) AIRS SNOs 2 V NLcorrected = VPamp + anlcvpamp a nlc = > V Pamp ( V = DC V DCoffset V DCoffset (time) ( time)) g DC V AC g AC New V203 sample for 201 (7 year data set in JAXA JSS2) Spectral bias were removed by applying new DC electrical circuit model to nonlinearity correction. Courtesy of R. Knuteson, F. Kataoka, J. Yoshida June, 2016, IWGGMS 11
12 - optimized global sampling patterns -12-
13 Present pattern with an agile secondary pointing system March 2011 Grid & Specular Reflection Mar., June, 2016, IWGGMS
14 Further modifications Simple 1deg grid is not appropriate to retrieve emission amount from point source Gauss model proposed to present Oil Field in California (Turner et al., 2015 ACP) Red: underestimated without GOSAT Blue: overestimated (Turner et al.) Different optimized spatial and temporal sampling pattern. CO 2 (missing sink) vs CH 4 (localized different emission sources) Surface (emission sources) vs. Atmosphere (transportation) > GOSAT observed spatial and temporal pattern with measurement errors (typically 0.5%) must be characterized first. June, 2016, IWGGMS 14
15 - Conclusion and Future plan -15-
16 Conclusion and Future plan Remaining errors and the next Update (1) 7.5 years dataset of V201 are available (2) 7 year sample V203 product for V210 in review. New TIR non-linearity correction applied. Glint flag in extended region modified. Will be released as V201 after fulltime data are reprocessed. (3) Radiometric calibration errors were much reduced but still exist due to: SWIR spectral feature within a band in prelaunch calibration (minor modification may be applied) TIR polarization sensitivity correction in CH 4 band (correction factor to be provided) (4) Target observation can be added more and optimized. New, status update, L1 algorithm June, 2016, IWGGMS 16
17 - Backup- -17-
18 V161 vs V201, Conversion tables of V007 vsv201 Gain M site (RRV) 2015/6/29 RRV, path 37 gain M V161(v007) V201(v201) V201(v007)= BestEstimated (radiance conversion)table : available from NIES GUIG June, 2016, IWGGMS 18
19 Wavenumber in L1B and radiance conversion table Radiance Conversion Table (prelaunch data was reprocessed with V070, V150, V201) prelaunch data (Feb. 2008) was reprocessed with WL start (cm -1 ) WL corrected (cm -1 ) Number of rows V070 (July 2009) Absorption (0.5 cm -1 interval) (not shown) 2601 (V070c) (May 2010) Envelope, released from NIES GUIG (not shown) 2601 V150 (May 2012) Envelope, released by request V201 (March 2016) Envelope, will be released from NIES GUIG (wavenumber corrected) Level 1B product WL start (cm -1 ) Interval (cm -1 ) Number of rows V150, 161 (raw) Radiance Degradation Factor in Kuze et al., used V150 data V201 (raw) (best estimated) Converted with V070c V150 table V210 (Best estimated) Will be converted with V (T.B.D.) (T.B.D,) 1504 The original radiance conversion table was made in 2008 using the catalogue-base laser-wavelength of 1.31 as shown below. The corrected uses the actually measured wavelength of the primary laser. L1B wavenumber is calculated with the above primary sampling laser (prelaunch) vacuum vale. Please note that the small change due to gradual alignment change ( in 2009 and in 2012) described in Fig.12, Kuze et al., 2012, AMT is NOT considered in L1B V201 as it is very small. Initial Pre-launch calculation until 2008, 1.31 micron (diode laser catalogue value). Primary Sampling laser (prelaunch) Vacuum (used since launch until now), micron (measured prelaunch). Secondary Sampling laser (pre-launch) Vacuum (never used in orbit), micron (measured prelaunch). June, 2016, IWGGMS 19
20 V201 note: spectral range selection, calibration accuracy, noise estimation <V201 Best estimated radiance, spectral range selection> We are providing the best estimated radiance for the users who are not familiar with the instrument and degradation in orbit. We asked the optical vender to provide an optical bandpass filter that has high and flat transmittance between cam-1 (775.2nm) and cm-1 (757.6nm). So this range has white (spectrally flat) noise even after radiance conversion. But outer the spectra is located, the radiance-converted noise becomes larger if we provide wider range. <V201 Best estimated radiance, calibration accuracy> For professional users, we recommend to use (1) raw data with spectrally white noise (V/cm-1), (2) the Radiance Conversion Factor of Feb 2016 (excel file) and (3) radiance degradation correction (1/(radiance conversion factor) by Tommy Taylor-san). The best estimated radiance is not perfect yet as radiance conversion factor used is an older version. But it is not so bad. The difference between the above-mentioned manuallyconverted value and the best estimated one is smaller than 1%. <V161 vs V201, Chi^2> Noise level can be estimated for out of band spectra. V161 out of band spectra include both real noise and artifact from non-linearity. V201 ones are close to noise. Therefore in some case, V161 Chi^2 look smaller. June, 2016, IWGGMS 20
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